Question 395206
{{{x^4  +x^2 + 1 = x^4  +2x^2  +1 - x^2 = (x^2  + 1)^2 - x^2 = (x^2 + 1 - x)(x^2  + 1  +x) = (x^2 -x + 1)(x^2  +x + 1)}}}